Motor compressor unit



Feb. 7, 1939. ou o c-f. 2,146,097

MOTOR COMPRES SOR UN IT Filed Dec. 16, 1937 4 SheetsSheet l v tl 3 Q Ira/era???" @726 $06450 73g, ZZV %%%@/M7M% %dw 0.

Feb. 7, 1939. J, TQUBORG 2,146,097

MOTOR COMPRESSOR UNIT Filed Dec. 16, 1937 4 Sheets-Sheet 2 1939- J TOUBORG MOTOR COMPRESSOR UNIT Filed Dec. 16, 1937 4 Sheets-Sheet 3 Feb. 7, 1939. J. TOUBORG v 2,146,097

MOTOR COMPRES SOR UN I T Filed Dec. 16, 1937 4 Sheets-Sheet 4 Patented Feb. 7, 1939 UNlTED STATES PATENT. OFFICE MOTOR COMPRESSOR UNIT Ions Touborg, Tecumseh, Mich asslgnor to Gibson Electric Refrigerator Corporation, Greenville, Mich, a corporation of Michigan Application December 1c, 1037, 861181 No. 180,247

'4 Claims.

This invention relates to improvements in motor compressor units and more especially such a device. particularly adapted for compressing or pumping fluids. The device may be used, for example, for compressing a fluid used in refrigerating apparatus, such as ammonia, freon, methyl chloride, or the like.

Among the features ofmy invention is the provision of a single cylinder compressor driven by a shaft lying in a relatively longsleeve forming a single bearing for the shaft. One'end of the shaft carries the crank operating the compressor and the other end carries-the armature of the driving motor. 3

Another feature of my invention is the provision of improved oiling means comprising in eneral an oil hole or duct beginning atthe bott m inside edge of the crank pin and leading diagonally upwardly and through the crank pin to a spiral groove" on the shaft. Since the inlet to the hole is substantially at the center of rotation while the outlet is approximately one-half inch away fromthe center of rotation, oil is drawn into and ,forced through the hole up into the bearing by means of centrifugal force where it is picked up by the spiral groove and properly distributed throughout the bearing.

Another feature of the invention is the'provision. of apiston and yoke construction of the Scotch yoke type with means for lubricating the piston and cross-slide by submerging them in oil."

Another feature of the invention is the =provision of a single casting serving as a casing for the compressor and as a support for the motor stator. This casing also supports the main sleeve the compressor casing; the entire casing for the motor compressor until being hermetically sealedi Another feature of the invention is improved means for closing the upper end of the frame casting by means of a cap screwed into the casting. The parts are machined so that the rim of the cap seats tightly against the frame casting in, such a way as to compress a round rubberring or gasket tightly into a recess provided therefor. This provides an excellent gas-tight closure and has the further advantage of providing compactness and neatness of appearance. This construction replaces the older type using flanges with a gasket held together by a large number of bolts. The screw seal gives more uniform pressure on the gasket and makes a better seal.

a substantially triangular one.

Other features and advantages will appear more fully as I proceed with my specification.

In that form of device embodying the features of my invention shown in the accompanying drawings -Fig. 1 is a view in side elevation; Fig. 2 is a view taken as indicated by the line 2 of Fig. 1; Fig. 3 is a view taken as indicated by the line 3 of Fig. 1; Fig. 4 is a view taken as indicated by the line 4 of Fig. i; Fig. 5 is a view taken as indicated by the line 5 of Fig. 3; Fig. 6 is a view taken as indicated by the line 6 of Fig. 3; Fig. 7 is a view taken as indicated by the line 1 of Fig. 3; Fig. 8 is a vertical sectional view taken through the crank pin; and Figs. 9 and 10 show the inlet valve for the compressor.

As shown in the drawings, the unit comprises principally a cylindrical frame casting A open at 'the top and bottom, with a threaded cap B to close the top and a base casting C in the form of a plate bolted to the lower end to close the bottom. D indicates a cylinder radially inserted in the casting A near the lowerend and held in position by the cap screws III, III. H, il indicate the cap screws holding the base plate C in position, and i2 indicates a gasket between the base plate and the lower end of the casting A to make atight connection. E indicates a head for the cylinder D which is also held in position by the cap screws Hi.

at the upper end of the frame or main casting A.

The lower edge of thecap B is slightly beveled at its periphery on the outside as indicated by l3. ll indicates a shoulder on the inner side of the upper end of the casting A below the threads, the lower edgeof the bevel l3 adapted to seat against said shoulder. rubber ring or gasket which is tightly compressed in the space between the bevel it, the shoulder is and the inner wall of the casting A when the cap B is screwed into place. As shown in Fig. 3, this gasket is compressed so that its cross section is distorted from a substantially circular one to This makes an hermetic seal between the cap 3 and the upper end of the cylindrical casing. A.

The cylinder D and its head E are secured tightly in position by means of the cap screws it, suitable gaskets or ground joints being provided to hermetically seal the parts. Likewise the gasket i2 servesto-hermetically seal the base plate describd an hermetically sealed casing which i5 indicates a round completely houses the motor and compressor to be hereinalter described. g

The casing A is provided at about the center or a short distance below the center with a spider or perforated diaphragm It supporting the lower end of a centrally arranged tubular or sleeve bearing H. Ha, Ha indicate radial strengthening ribs on the underside of the perforated diaphragm i6.

When the confined gasket I! has been compressed into the machined recess in the casting.

quickly exchange a worn or dan age'd cylinder for a new one, also toexchange on'e cylinder for I I .another of different size in orderto change the displacement and resulting pumping capacity of the compressor whenever desirable.

l8 indicates a vertical shaft in the sleeve hearing l1 carrying on its lower end the crank pin or eccentric is operating through the hollow cylindrical yoke 20 and cylindrical crosshead 2i to reciprocate the piston 22 in the cylinder D.-

In a broad sense the crank pin oreccentric I! is considered as an extension or part of the shaft ll. 23 indicates a member centered on the crank pin it with respect to the axis 01 the shaft ll to-"i'orm a thrust bearing for'the shaft and associated parts. II 'I'helower end of this member rests against the center of the base plate C. I 4

The upper end of the shaft It carries the electrical motor rotor 24 and this preferably depends somewhat -so that it overlaps the upper end of the sleeve bearing i1. Outside of the rotor 24 is, a

that it is, capable oi manymodifications.

the stator 25 carried on the inside oi. the casing A. 1 28 indicates one of the electrical conrections to the stator-ii, thegther not beingshown. 'The electrical connections are carried through the wall of the casingA and suitably insulated and hermetically sealed.

21 indicates an oil duct with its lower end at the bottom inside edge oi the crank pin I! lead-. ing diagonally upwardly through the crank pin to I the lower end, of the spiral groove 28 on theshait. The lower end of the duct 11 lies substantially in alignment with the axis oi the shall; it.

awayfrom the center oi rotation.- Because of this construction, oil is drawn into and forced through the hole 21 up into the bearing by means oi centrifugal force where it is picked up by the spiral groove II and properly distributed throughoutthelength oithesleeve bearing-l1. v l.

The piston, cross slide. and crank pin receive their lubrication. by virtue of the iactthat they run practically submerged in oil. ,That is, a pool v ing'II.

' u leads to theport "connecting with the La indicates the inlet to the casingthrough whichtheiluidtobeco'mpressedisdrawn. l'rom the interior or the casing the fluid enters passion cylin'der D through the port II as shown 2. The compressed fluid leaves the cylinder l a'iter compression through the port ii The upper end of this grooveilabout one-half inch l yshait outlet s as shown in Fig. 4. :4 indicates a suitable outlet valve for the compressor cylinder. 3!

indicates a by-pass ccntrolledby the unloader valves 30 which. are not described here as they constitute no 'part of the present invention. The inlet valve for the compressor is in the term of a wafer flapper as shown in the drawings; but since the details of this valve form no part of the present invention they need not be described here.

It is to be understood that the compressor cylinder D may be provided with any suitable inlet and outlet valves. I

The; base'plate O ls/provided with four integrally-i'orlned arms II, II provided with holes 52 in their ends adapted to receive mounting.

bolts or screws for suitably supporting the unit'in position on any suitable foundation or base.- The base plate .6 with the arms II are preferably formed oi. one casting which is screwed to the bottom of the main casing A by the screws H to hermetically seal the bottom oi-thecasing and also form a suitable base for the unit. I

The piston 22 with its skirt 22a andthe hollow cylindrical yoke 20 are all cast in one piece, the latter be lmvided with slots Ila to accommodate the crank pin it during the reciprocations of the crosshead 2| in the yoke 20. The yoke '20 is: also provided with an; aperture 20b at one side to permit entry of 0111 ll to the crosshead; and the yoke'near its top at-the other side is also provided with an oil duct 28c. p

- The casing A, sleeve bearing l1 and diaphragm it supporting the same are/all ri'ormed of one integral casting. lib, lib indicate holes in the diaphragm Ii.

it of the cylinder D and thawing A in order to make a tight Joint; and there inay also be a gasket I1 between the cylinder D and the cylinder head E. 1 fi 1 While I have shown described certain embodiments of my inven on, it late be understood tion to claim all novelty inherent in my inven tlon as broadly as permissible, in view oi the prior What I claim as new, and desire to'secure by Letters Patent, is: a I I sleeve bearing axially located in the casing;

in the sleeve bearing: a piston inth mma drivingconnectim between thelower end der;

'. oithe shai'tand the piston. including a crank a a as I It may indicate a gasket between the flange I the lower end of the shaft to the sleeve bearing.

the lower end of said oil duct beins nearer the axis of rotation of the shaft than the upper end, said lower end or said oil duct being open and adapted to be submerged in a pool oi oil in the lower part of the casing.

3. A motor compressor unit, including: a vertical cylindrical casing adapted to contain a pool of oil in the lower part thereof; a vertical sleeve bearing axially located in the casing; a shaft in the sleeve bearing; a compressor at the bottom oi the casing; a driving connection between the shaft and the compressor; means for driving the shaft; and a slanting .oil duct leading from the lower end of the shaft to the sleeve bearing. the lower end of said oilduct being nearer the axis of rotation of the shaft than the upper end, said lower end of said oil duct being open and adapted tobe submerged in a pool of oil in the lower part of the casing.

I 4. A motor compressor unit, including: a vertical cylindrical casing adapted to contain a pool of oil in the lower part thereof a vertical sleeve bearing axially located in the casing; a shaft in the sleeve bearing; a compressor at the bottom of the casing; is driving connection between the shaft and the compressor; means-tor driving the shaft; and an oil duct leading from the lower end of the shaft to the sleeve bearing, the lower end 0! said oil duct being open and the lower portion thereof adapted to be submerged in a poolot oil in the lower part of said casing, a lower part of vsaid submerged portion being nearer the axis of rotation of said shaft than a highegpart 0! said submerged portion. whereby centrifugal action caused by rotation of the shaft will force upwardly oil standing in said lower portion of said duct.

ms 2c 

